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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Shares    
Outstanding January 1, 2015 10,670,000  
Granted 7,976,000  
Cancelled/Expired (810,000)  
Exercised (18,020) (234,500)
Outstanding, December 31, 2015 17,818,053 10,670,000
Exercisable, December 31, 2015 9,406,000  
Vested and Expected to Vest, December 31, 2015 2,756,000  
Available for future grant as of December 31, 2015 8,960,000  
Weighted Average Exercise Price    
Outstanding January 1, 2015 $ 4.95  
Granted 2.16  
Cancelled/Expired 3.75  
Exercised 1.76  
Outstanding, December 31, 2015 3.76 $ 4.95
Exercisable, December 31, 2015 5.02  
Vested and Expected to Vest, December 31, 2015 $ 4.04  
Weighted Average Remaining Contractual Term    
Outstanding, December 31, 2015 8 years  
Exercisable, December 31, 2015 6 years 10 months 24 days  
Vested and Expected to Vest, December 31, 2015 8 years 1 month 6 days  
Aggregate Intrinsic Value    
Outstanding, December 31, 2015 $ 1,949  
Exercisable, December 31, 2015 833  
Vested and Expected to Vest, December 31, 2015 $ 520